KR20100059052A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20100059052A
KR20100059052A KR1020080117691A KR20080117691A KR20100059052A KR 20100059052 A KR20100059052 A KR 20100059052A KR 1020080117691 A KR1020080117691 A KR 1020080117691A KR 20080117691 A KR20080117691 A KR 20080117691A KR 20100059052 A KR20100059052 A KR 20100059052A
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KR
South Korea
Prior art keywords
liquid crystal
crystal layer
field distortion
distortion member
electric field
Prior art date
Application number
KR1020080117691A
Other languages
Korean (ko)
Inventor
이태희
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020080117691A priority Critical patent/KR20100059052A/en
Publication of KR20100059052A publication Critical patent/KR20100059052A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/121—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode common or background
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/123—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode pixel

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Liquid Crystal (AREA)

Abstract

A liquid crystal display device is disclosed. The liquid crystal display device includes a liquid crystal layer; An electrode disposed under the liquid crystal layer; And an electric field distortion member interposed between the liquid crystal layer and the electrode. The liquid crystal display device can apply various electric fields to the liquid crystal layer by the electric field distortion member, and thus has an improved wide viewing angle.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

An embodiment relates to a liquid crystal display device.

As information processing technology develops, display devices such as LCD, PDP and AMOLED are widely used. In particular, research is underway to improve the narrow wide viewing angle of LCDs.

Embodiments provide a liquid crystal display having an improved wide viewing angle.

In another embodiment, a liquid crystal display device includes: a liquid crystal layer; An electrode disposed under the liquid crystal layer; And an electric field distortion member interposed between the liquid crystal layer and the electrode.

A liquid crystal display device according to an embodiment includes: a liquid crystal display device having a plurality of pixel areas defined therein, the first and second electrodes disposed in the pixel area and corresponding to each other; A liquid crystal layer disposed in the pixel region; An electric field distortion member interposed between the electrode and the liquid crystal layer and distorting an electric field formed between the first electrode and the second electrode to apply a first electric field and a second electric field to the liquid crystal layer.

In the liquid crystal display according to the exemplary embodiment, various electric fields may be applied to the liquid crystal layer by the field distortion member. In particular, the field distortion member may be formed of a dielectric having a step.

Accordingly, the liquid crystal layer is divided into regions to which different electric fields are applied by the electric field distortion member. At this time, the domains of the liquid crystals are different for each region, and the liquid crystal layer has a multi domain.

Accordingly, the liquid crystal display according to the embodiment may implement a clear image from various angles and have an improved optical viewing angle.

In the description of the embodiment, each panel, member, electrode, layer, part, or substrate is formed on or under the "on" of each panel, member, electrode, layer, part, or substrate, and the like. When described as being "in" and "under" includes both those that are formed "directly" or "indirectly" through other components. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is a circuit diagram illustrating a liquid crystal display according to an embodiment. 2 is a plan view of a pixel. FIG. 3 is a cross-sectional view taken along the line A-A 'of FIG. 2. 4 is a diagram illustrating operating characteristics of the liquid crystal layer.

1 to 3, the liquid crystal display device includes a liquid crystal panel 10 and a driver 20.

The liquid crystal panel 10 displays an image by an electrical signal input from the driver 20. The liquid crystal panel 10 displays an image by adjusting the intensity of light passing through the pixel area P.

Referring to FIG. 2, the pixel area P is divided into a first area L1, a second area L2, a third area L3, and a fourth area L4. The first to fourth regions L1, L2, L3, and L4 are arranged in a stripe shape.

Alternatively, the first to fourth regions L1, L2, L3, and L4 may be arranged in various forms such as tiles.

Referring to FIG. 3, the liquid crystal panel 10 includes a lower substrate 110, a wiring layer 115, a pixel electrode 140, an upper substrate 120, a common electrode 160, a liquid crystal layer 130, and electric field distortion. The member 170 is included.

In addition, the liquid crystal panel 10 may further include a color filter layer 150.

The lower substrate 110 is transparent and has a plate shape. The lower substrate 110 may be a glass substrate.

The wiring layer 115 is disposed on the lower substrate 110. The wiring layer 115 applies an electrical signal applied from the driver 20 to the pixel electrode 140.

The wiring layer 115 includes a plurality of gate lines GL, a plurality of data lines DL, and thin film transistors TFT disposed in an area where the gate lines GL and data lines DL intersect. ).

The pixel electrode 140 is disposed on the lower substrate 110. In more detail, the pixel electrode 140 is disposed on the wiring layer 115. One pixel electrode 140 is disposed in each pixel area P. FIG. A plurality of pixel electrodes 140 are arranged in a matrix form on the lower substrate 110.

The pixel electrode 140 is a transparent conductor, and examples of the material used as the pixel electrode 140 include indium tin oxide or indium zinc oxide.

The upper substrate 120 is disposed on the lower substrate 110. The upper substrate 120 faces the lower substrate 110. The upper substrate 120 may be transparent and may be a glass substrate.

The color filter layer 150 may be disposed below the upper substrate 120. The color filter layer 150 includes color filters that filter the white light passing through and convert the white light into color light.

The color filters may be arranged one by one in each pixel area P. FIG.

When the color filter layer 150 is further included as described above, the common electrode 160 is disposed under the color filter layer 150.

The common electrode 160 is a transparent conductor, and examples of the material used as the common electrode 160 may include indium tin oxide or indium zinc oxide.

The liquid crystal layer 130 is interposed between the pixel electrode 140 and the common electrode 160. In more detail, the liquid crystal layer 130 is interposed between the field distortion member 170 and the common electrode 160.

The liquid crystal layer 130 is vertically aligned. That is, liquid crystals included in the liquid crystal layer 130 are aligned in the vertical direction when no electric field is formed in the pixel electrode 140 and the common electrode 160. In addition, the liquid crystal layer 130 is aligned with a plurality of domains by an electric field formed by the pixel electrode 140, the common electrode 160, and the electric field distortion member 170.

The liquid crystal layer 130 includes a smectic liquid crystal, a nematic liquid crystal or a cholesteric liquid crystal.

The liquid crystal layer 130 displays images by an applied electric field together with polarization filters disposed on the upper substrate 120 and below the lower substrate 110, respectively.

The field distortion member 170 is interposed between the liquid crystal layer 130 and the pixel electrode 140. The field distortion member 170 deforms an electric field applied to the liquid crystal layer 130. In more detail, the field distortion member 170 reduces the electric field applied to the liquid crystal layer 130.

The field distortion member 170 may orientate the liquid crystal layer 130. That is, the field distortion member 170 may perform an alignment layer function. The field distortion member 170 has a high dielectric constant, and examples of the material that may be used as the field distortion member 170 include silicon oxide and the like.

The field distortion member 170 has a step. The field distortion member 170 includes a first field distortion member 171, a second field distortion member 172, a third field distortion member 173, and a fourth field distortion member 174 that form a step with each other. do.

The first to fourth field distortion members 171, 172, 173, and 174 have different thicknesses. For example, the first field distortion member 171 has a thickness of 190 to 210 kPa, the second field distortion member 172 has a thickness of 390 to 410 kPa, and the third field distortion member 173 It has a thickness of 590 ~ 610Å, the fourth field distortion member 174 may have a thickness of 790 ~ 810Å.

In addition, the first field distortion member 171 has a thickness of 290 to 310Å, the second field distortion member 172 has a thickness of 590 to 610Å, and the third field distortion member 173 has a thickness of 890 To 910 kPa, and the fourth field distortion member 174 may have a thickness of 1190 to 1210 kPa.

A plurality of gaps are formed between the liquid crystal layer 130 and the pixel electrode 140 by the field distortion member 170. That is, the distance between the liquid crystal layer 130 and the pixel electrode 140 is determined by the first to fourth field distortion members 171, 172, 173, and 174.

The pixel region P is defined by the first and fourth regions L1, L2, L3, and L4 by the electric field distortion member 170. That is, the first region L1 is defined by the first field distortion member 171, and the second region L2 is defined by the second field distortion member 172.

Similarly, the third region L3 is defined by the third field distortion member 173, and the fourth region L4 is defined by the fourth field distortion member 174.

In addition, the liquid crystal layer 130 may also be divided by the field distortion member 170. That is, the liquid crystal layer 130 includes a first liquid crystal layer 131, a second liquid crystal layer 132, a third liquid crystal layer 133, and a fourth liquid crystal layer 134.

The first liquid crystal layer 131 corresponds to the first field distortion member 171 and is disposed in the first region L1.

The second liquid crystal layer 132 corresponds to the second field distortion member 172 and is disposed in the second region L2.

The third liquid crystal layer 133 corresponds to the third field distortion member 173 and is disposed in the third region L3.

The fourth liquid crystal layer 134 corresponds to the fourth field distortion member 174 and is disposed in the fourth region L4.

Different electric fields are applied to the liquid crystal layer 130 by the electric field distortion member 170. That is, when the common voltage and the data voltage are applied to the common electrode 160 and the pixel electrode 140, the electric field applied to the liquid crystal layer 130 is distorted by the electric field distortion member 170. .

Accordingly, different electric fields are formed for each of the first to fourth regions L1, L2, L3, and L4. That is, different electric fields are formed in the first to fourth liquid crystal layers 131, 132, 133, and 134.

That is, the electric field distortion member 170 has a high dielectric constant and has different thicknesses T1, T2, T3, and T4 for each of the first to fourth regions L1, L2, L3, and L4. Different electric fields are applied to the first to fourth liquid crystal layers 131, 132, 133, and 134.

More specifically, since the thickness increases in the order of the first to fourth field distortion members 171, 172, 173, and 174, the electric field applied in the order of the first to fourth liquid crystal layers 131, 132, 133, and 134. Is less.

That is, since the first electric field distortion member 171 has the thinnest thickness T1, the highest electric field is applied to the first liquid crystal layer 131.

Similarly, since the fourth electric field distortion member 174 has the thickest thickness T4, the lowest electric field is applied to the fourth liquid crystal layer 134.

Therefore, the first to fourth liquid crystal layers 131, 132, 133, and 134 may have different optical characteristics according to the common voltage and the data voltage. That is, each of the liquid crystals included in the first to fourth liquid crystal layers 131, 132, 133, and 134 may have different domains.

Referring to FIG. 4, as the potential difference applied to the common electrode 160 and the pixel electrode 140 is applied, optical characteristics of the first to fourth liquid crystal layers 131, 132, 133, and 134 may be reduced. It can be seen that the difference. That is, the liquid crystals included in the first to fourth liquid crystal layers 131, 132, 133, and 134 have different domains by the field distortion member 170.

The highest electric field is applied to the first liquid crystal layer 131. Accordingly, the liquid crystal included in the first liquid crystal layer 131 has the largest tilt angle. That is, the liquid crystal included in the first liquid crystal layer 131 has a first domain.

In addition, a lower electric field is applied to the second liquid crystal layer 132 than the first liquid crystal layer 131. Accordingly, the liquid crystal included in the second liquid crystal layer 132 has a smaller tilt angle than the liquid crystal included in the first liquid crystal layer 131. That is, the liquid crystal included in the second liquid crystal layer 132 has a second domain.

In addition, a lower electric field is applied to the third liquid crystal layer 133 than the second liquid crystal layer 132. Accordingly, the liquid crystal included in the third liquid crystal layer 133 has a smaller tilt angle than the liquid crystal included in the second liquid crystal layer 132. That is, the liquid crystal included in the third liquid crystal layer 133 has a third domain.

Similarly, the lowest electric field is applied to the fourth liquid crystal layer 134, and accordingly, the liquid crystal included in the fourth liquid crystal layer 134 has the smallest tilt angle. That is, the liquid crystal included in the fourth liquid crystal layer 134 has a fourth domain.

That is, the first to fourth liquid crystal layers 131, 132, 133, and 134 may have different optical characteristics even when an electric field is applied by one pixel electrode 140 and one common electrode 160. have.

Accordingly, in the liquid crystal display according to the exemplary embodiment, liquid crystal layers having different domains are disposed in one pixel region P, respectively. Accordingly, the liquid crystal display according to the embodiment displays a uniform image in various directions and has a wide viewing angle.

That is, one pixel region P is divided into a plurality of regions L1, L2, L3, and L4 each having a different domain by the electric field distortion member 170. Accordingly, when one pixel area P is divided into a plurality of areas L1, L2, L3, and L4, and the areas L1, L2, L3, and L4 are viewed from different angles, the pixel area P is clear. Display the video.

Accordingly, the liquid crystal display according to the embodiment may compensate for the viewing angle and implement an improved wide viewing angle.

The liquid crystal display device according to the present embodiment is not only applicable to the VA mode, but also to the liquid crystal display device of various modes such as the IPS mode, the SPVA mode, and the SVA mode.

5A to 5E are cross-sectional views illustrating a method of manufacturing a liquid crystal display device according to an embodiment.

Referring to FIG. 5A, a lower substrate 110 that is a glass substrate is provided. Thereafter, a wiring layer 112 including gate lines, data lines, and thin film transistors is formed on the glass substrate 110. Thereafter, an ITO layer is formed and patterned on the wiring layer 112 to form the pixel electrode 140.

Thereafter, the first silicon nitride layer 170a covering the pixel electrode 140 is formed on the lower substrate 110 to have a thickness of 190 to 210 kV or 290 to 310 kV.

Referring to FIG. 5B, a first shadow mask 201 is disposed on the first silicon nitride layer 170a, and optionally, silicon nitride is deposited to form a second silicon nitride layer 170b.

Referring to FIG. 5C, a second shadow mask 202 is disposed on the second silicon nitride layer 170b, and optionally, silicon nitride is deposited to form a third silicon nitride layer 170c.

Referring to FIG. 5D, a third shadow mask 203 is disposed on the third silicon nitride layer 170c, and optionally, silicon nitride is deposited to form a fourth silicon nitride layer 170.

In this manner, the electric field distortion member 170 having a step is formed.

Thereafter, an ion beam is irradiated onto the field distortion member 170, so that the field distortion member 170 is oriented.

Referring to FIG. 5E, a color filter layer 150 and a common electrode 160 are formed below the upper substrate 120, and a liquid crystal is injected between the upper substrate 120 and the lower substrate 110 to form the liquid crystal. A layer 170 is formed, and a liquid crystal display device according to an embodiment is manufactured.

As a result, a liquid crystal display device having an improved wide viewing angle may be manufactured.

Although described above with reference to the embodiment is only an example and is not intended to limit the invention, those of ordinary skill in the art to which the present invention does not exemplify the above within the scope not departing from the essential characteristics of this embodiment It will be appreciated that many variations and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

1 is a circuit diagram illustrating a liquid crystal display according to an embodiment.

2 is a plan view of a pixel.

FIG. 3 is a cross-sectional view taken along the line A-A 'of FIG. 2.

4 is a diagram illustrating operating characteristics of the liquid crystal layer.

5A to 5E are cross-sectional views illustrating a method of manufacturing a liquid crystal display device according to an embodiment.

Claims (11)

Liquid crystal layer; An electrode disposed under the liquid crystal layer; And And a field distortion member interposed between the liquid crystal layer and the electrode. The liquid crystal display of claim 1, wherein the field distortion member has a step. The liquid crystal display of claim 1, wherein the electric field distortion member has a thickness that varies depending on a position. The liquid crystal display of claim 1, wherein the field distortion member comprises silicon oxide. The method of claim 1, wherein the field distortion member A first electric field distortion member spaced apart from each other by the first gap between the liquid crystal layer and the electrode; And And a second field distortion member spaced apart from each other by the second gap between the liquid crystal layer and the electrode. 6. The liquid crystal display of claim 5, wherein the field distortion member comprises a first field distortion member having a first thickness and a second field distortion member having a second thickness. 7. The liquid crystal display of claim 6, wherein the liquid crystal layer comprises a first liquid crystal layer corresponding to the first field distortion member and a second liquid crystal layer corresponding to the second field distortion member, The first liquid crystal layer is aligned by the first electric field, And the second liquid crystal layer is aligned by a second electric field. The liquid crystal display of claim 7, wherein the first liquid crystal layer and the second liquid crystal layer have different domains. In a liquid crystal display device in which a plurality of pixel areas are defined, A first electrode and a second electrode disposed in the pixel area and corresponding to each other; A liquid crystal layer disposed in the pixel region; A liquid crystal including an electric field distortion member interposed between the electrode and the liquid crystal layer and distorting an electric field formed between the first electrode and the second electrode to apply a first electric field and a second electric field to the liquid crystal layer. Display. The liquid crystal layer of claim 9, wherein the liquid crystal layer is defined as a first region to which the first electric field is applied and a second region to which the second electric field is applied. The first region and the second region have different domains. The method of claim 10, wherein the field distortion member A first field distortion member corresponding to the first region, having a first thickness and being a dielectric; And And a second field distortion member corresponding to the second region, having a second thickness and being a dielectric.
KR1020080117691A 2008-11-25 2008-11-25 Liquid crystal display device KR20100059052A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016052922A1 (en) * 2014-09-29 2016-04-07 한양대학교 산학협력단 Transparent display device capable of blocking external light if necessary
WO2019047695A1 (en) * 2017-09-05 2019-03-14 京东方科技集团股份有限公司 Array substrate, liquid crystal display panel and display device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016052922A1 (en) * 2014-09-29 2016-04-07 한양대학교 산학협력단 Transparent display device capable of blocking external light if necessary
WO2019047695A1 (en) * 2017-09-05 2019-03-14 京东方科技集团股份有限公司 Array substrate, liquid crystal display panel and display device
US10818700B2 (en) 2017-09-05 2020-10-27 Boe Technology Group Co., Ltd. Array substrate, liquid crystal display panel and display device

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